中继

继电器是重要的设备用于各种各样的应用cations to control one circuit through another separate circuit. To learn more about them and how they work, read this informative guide.

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中继

What Are Relays?

继电器是一种由电流提供电流的开关或放大器类型。它允许一个电路控制另一个没有物理连接的两个电路的另一电路。继电器通过使用磁场或电信号来触发第二电路以从打开位置改变为关闭的第二电路,反之亦然。实际上,继电器可以打开或关闭设备。

继电器的目的

中继are invaluable tools since they allow one circuit to control another. More specifically, they enable circuits of differing voltage levels to interface with each other.

这种能力是有用的,因为许多传感器是产生小电流的电子设备。当贵公司需要这些精致的传感器来驱动具有较大电流的设备时,您需要一些东西来弥合差距。这正是继电器所做的。继电器允许在低功耗中运行的电子设备,例如计算机或微控制器,以控制高通用的电子设备或机器,如灯,吊扇或工业机械。

For example, an electronic thermometer could prompt a space heater to turn on by using a relay since the small electric current in the thermometer would not be enough to power the heater on its own. Relays also have many applications in automotive manufacturing. They allow electronic sensors to turn on windshield wipers or headlights, sound warnings to buckle up, or set off security alarms.

中继can also use one circuit to control multiple other circuits. This means you can use one sensor to turn on multiple devices at once.

一些继电器被认为是保护继电器,因为它们检测到电路中的故障或异常条件并启动适当的控制电路动作。在许多情况下,这意味着触发断路器。

继电器的工作原理

继电器的基本功能非常简单,整个过程只需一秒钟的一小部分。继电器如何部分地取决于其工作原理,我们将更多地讨论下面。在这里,我们将专注于机电继电器。继电器坐在两个电路之间,第二个电路比第一电路大。

When the first circuit provides an electrical current to the relay, a coil in the relay produces a magnetic field. This field causes an armature to move contacts, either together to close the second circuit or apart to open it.

默认情况下保持打开的电路直到继电器导致电路关闭“常开”(否)继电器。当电源被移除时,继电器中的弹簧将触点分开,打开第二电路并关闭端部设备。

没有继电器是最常见的类型,但有些是“常闭”(NC)。利用这些继电器,触点默认保持连接,直到继电器产生的电磁场拉动连接器,关闭终端设备。

Types-of-Relays

继电器的类型

Though all relays share similar functionalities, relays come in numerous types to suit different applications. The various types of protection relays can be defined by aspects of how they’re made or used. Let’s look at some common ways we can divide relays by their different categories.

Poles and Throw Combinations

分类继电器的一种方法是通过它的杆子来投掷。POLES参考继电器中的开关数,并抛出指的是每个杆可以进行的位置的数量。这是每个极杆可以控制的电路数量。

The simplest example is a single pole single throw relay (SPST). An SPST relay can switch a single circuit on or off. In a single pole double throw (SBDT) relay, the relay can only control one circuit at a time. However, by closing one circuit it will open the other, and vice versa. Other types of poles and throw combinations include double pole single throw (DPST) and double pole double throw (DPDT).

Relay Forms

另一种方式,我们可以通过它们的联系配置或“形式”来分类继电器。各种继电器表格用字母表的字母标记。例如,中继的表单是默认情况下通常打开的SPST继电器。Form B继电器是默认情况下通常关闭的SPST继电器。

最常见的形式是A,B,C和D,但也有更多。这些标记在字母表中的其他字母标记,并采用更复杂的配置。

操作原则

您将看到归档的主要方式之一是他们的运营原则。一些主要类型的继电器包括:

  • 机电:机电继电器使用在接收电流时产生磁场的线圈。磁场吸引电枢,以将触头推在一起或分开,从而关闭或打开第二电路。当线圈的电源切断时,磁场消失,弹簧返回到其前位置的接触。机电继电器可以处理异常大的电流。
  • Solid-state:固态继电器没有移动部件。它们使用半导体而不是机械部件。在这种情况下,电流导致红外光亮起。半导体感测光并将该信号转换为电信号,其打开或关闭第二电路。固态继电器通常比其他类型小,并且可以更快地开启或关闭电路,使它们在计算机上特别有用。
  • Reed:Like electromechanical relays, reed relays also employ an electromagnetic coil. However, rather than moving mechanical contacts, the magnetic field attracts two metal blades called reeds. These reeds are contained in a gas-filled glass tube. Similar to solid-state relays, an advantage of this model over electromechanical types is a lack of moving armatures. That means the relay’s parts won’t wear out.

继电器和断路器之间的差异

一些times relays are compared to circuit breakers because they are both a type of switch. However, the basic function and application of these devices are different. Fundamentally, a relay allows one circuit to control another, while a circuit breaker interrupts the flow in a faulty circuit. It isolates a faulty circuit from another circuit or power source.

Like a circuit breaker, a circuit protection relay can help address a fault in a circuit. In this scenario, the relay senses the problem, while the circuit breaker isolates the faulty part of the circuit from the rest of the system.

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继电器是许多设备类型和系统中的重要组成部分。bob亚博平手机登录全球电子服务提供各种继电器,以满足各种应用。通过我们的选择浏览,找到合适的工作和bob sports今天。如果您不确定您的需要或有任何疑问,我们的专家可以帮助您,请致电877-249-1701。

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